1. a Department of Electrical and Computer Engineering and Laboratory for Laser Energetics , University of Rochester , Rochester , NY , 14627-0231 , USA
2. b Institute of Electron Technology , PL-02668 , Warszawa , Poland
3. c Optical Sciences Division, Naval Research Laboratory , Washington , DC , 20375 , USA
4. d Department of Physics , Moscow State Pedagogical University , Moscow , 119435 , Russia
5. e Institute of Physics, Polish Academy of Sciences , PL-02668 , Warszawa , Poland